Linlai E 6sn7 tubes

I've been using a pair of NOS Sylvania 6SN7s I prefer them to Shuguang although no flies on the Schuguang. 

There are so many variants of Sylvania 6SN7. Can you be more specific?

Scroll down to see Sylvania's production through the years. And there are subgroups within these tube types. I use an assortment of Sylvania in my system.

I got them from audio tubes.com The ower picked them based on my budget. $59.95 each. Ask the owner for his recommendation. He has turned me to great tubes on two occasions. The web site has a list of what's available. Yes it is confusing. Talk to Brent. The tubes looks like a military WGT.

@fredcdobbs 

I've been buying from Brent for years, and yes, he does make great recommendations. 

I've used every type of Sylvania 6SN7 except the metal base. Currently, I have WWII VT-231's and 6SN7GT 3-holes in my amp. The VT-231 is milspec and presents a transparent wide, 3D soundstage. These tubes have become very expensive. The GT is more dynamic with smooth extended highs and a deep low-end. All Sylvanias present a sense of realism.

I'd like to buy more VT-231's (they're so quiet and clear) but I'm waiting for the Linlai's to arrive. 

Just ordered 2 more Linlai E 6sn7 for the Don Sachs preamp. Interested to hear it with all Linlai tubes. I've got 25 hours of playtime on the 1st two.

Thanks,

aldnorab